Ta2NiSe5 Crystal

Description

Description Ta2NiSe5 is a semimetal with an exciton-insulator transition at ~330K. Excitonic insulators are novel material systems that exhibit correlated electronic phases. When the exciton binding energy (Eb) is greater than the band gap (Eg), the excitons condense to their ground state.

Features And Benefits

Features And Benefits Exciton condensation in semiconductors occurs via the Bose-Einstein condensation process, whereas condensation in semimetals occurs via the Bardeen-Cooper-Schrieffer (BCS) process. Spontaneous band hybridization induced by Coulomb attraction between orthogonal conduction (electron) and valence (hole) bands opens the band gap and drives the system into an insulating state.

Application

Application Energy storage, catalysis, analytical chemistry, mechanics, adsorption, biology, microelectronics, sensors, etc.

Specifications

Molecular Weight	815.389 g/mol
Purity	6N(99.9999%) or better
Density	7.17 g/cm³
Appearance	Silver to dark gray crystals
Bandgap	0.00 eV
Characterization Methods	SIMS, XRD, EDS, Raman
Crystal Structure And Type	Orthorhombic Cmcm No 63
Dimension	1 cm
Electrical Property	Semimetal, excitonic insulator
Production Method	Flux zone growth, Chemical vapor transport
Storage Conditions	Room temperature and dry
Type	Synthetic
Unit Cell Parameters	a = 0.351 nm, b = 0.703 nm, c =1.578 nm, α = 89.9°, β = 89.7, γ =75.54°